Open Instagram and go to your Direct Messages
Tap the chat you want to reply to
Type your message in the text box
Tap Send
To reply to a specific message, press and hold the message
Tap Reply
Type your response
Tap Send
To reply with a photo, tap the camera or gallery icon
Select or take a photo
Tap Send
To reply with a voice message, press and hold the microphone icon
Record your message
Release to send
To reply to a story mention, tap the notification
Type your response in the chat
Tap Send